KR20000023399A - Method and apparatus for recording and/or reproducing digital signal and record medium of tape type - Google Patents

Abstract

PURPOSE: An apparatus for reproducing a digital signal is provided to record a signal of a high quality at a magnetic tape during a long time, and to be easy to be an additional record of data and an edition. CONSTITUTION: A reproducing part reproduces record data and expansion data from a second magnetic tape which has a wider width than a predetermined tape. The record data and the expansion data of the record data are recorded at the predetermined tape that a first magnetic tape has a width of the predetermined tape. The record data corresponds to a digital record format applied to the first magnetic tape. A record data processing part executes a data process of the record data reproduced by the reproducing part. An expansion data process part executes a data process of the expansion data produced by the reproducing part. The reproducing part continuously reproduces record data of at least two-track amount in the digital record format from one track formed at the second magnetic tape.

Description

Magnetic recording apparatus and method of digital signal, magnetic reproduction apparatus and method of digital signal and tape-shaped recording medium {Method and apparatus for recording and / or reproducing digital signal and record medium of tape type}

The present invention relates to a magnetic recording apparatus and method of a digital signal for recording or reproducing a digital signal with respect to a magnetic tape, a magnetic reproducing apparatus and method for a digital signal, and a tape-shaped recording medium on which a digital signal is recorded.

(Conventional technology)

In recent years, home-use camera integrated digital video tape recorders and home-use digital video tape recorders for recording digital video signals and digital audio signals on magnetic tapes have emerged.

As a recording method of such a digital video tape recorder, there is a format called a DV method (IEC 61834 helical scan digital video tape cassette recording system using 6.35 mm magnetic tape for consumers (525/60, 625/50, 1125/60 and 1250). / 50 systems) In this DV system, the tape width of the video tape used is 6.35 mm (= 1/4 inch), and the recording method of a conventional analog video tape recorder (for example, 8 mm system: IEC 60843 helical) scan video tape cassette recording system using 8mm magnetic tape for consumers) The tape width is narrower than that of the video tape used by the consumer.The DV system compresses the signal to record and increases the recording density. Long time recording is possible with higher image quality than the conventional method.

By the way, although there is no compatibility between the DV system and a conventional analog video tape recorder (e.g., 8 mm), for example, a wide tape tape used in this conventional recording method can be used. If the signal in the DV system can be recorded, it is possible to record a high quality signal for a longer time. In this manner, when the DV recording method can be performed on the video tape used in the conventional recording method, resources such as production equipment and parts of the video tape used in the conventional recording method can be effectively used. Will be.

INDUSTRIAL APPLICABILITY The present invention effectively utilizes conventional production equipment, parts, and the like of a magnetic tape, and records a high-quality signal on a magnetic tape for a long time, and facilitates additional recording, editing, and the like of data. And to provide a method.

In addition, the present invention effectively utilizes a conventional production equipment, parts, and the like of a video tape, and can reproduce a signal from a magnetic tape that has recorded a high-quality signal for a long time, and facilitates additional recording and editing of data. It is an object of the present invention to provide an apparatus and method for reproducing a signal.

It is also an object of the present invention to provide a tape-shaped recording medium capable of recording high quality signals and facilitating additional recording and editing of data.

(Means to solve the task)

A magnetic recording apparatus of a digital signal according to the present invention includes recording data generating means for generating recording data corresponding to a digital recording format applied to a first magnetic tape having a predetermined tape width, and generating extended data of the recording data. Extended data generating means and recording means for recording the record data generated by the record data generating means and the extended data generated by the extended data generating means on a second magnetic tape having a wider tape width than the first magnetic tape. The recording means includes at least two tracks of recording data and the extended data generating means in the digital recording format generated by the recording data generating means for one track formed in the second magnetic tape shape. The extended data generated is continuously recorded.

In the magnetic recording apparatus of this digital signal, at least two tracks in the digital recording format applied to the first magnetic tape with respect to one track formed in the shape of the second magnetic tape having a wider tape width than the first magnetic tape. Record data and extended data are recorded continuously.

A magnetic signal recording method of a digital signal according to the present invention generates recording data corresponding to a digital recording format applied to a first magnetic tape having a predetermined tape width, generates extended data of the recording data, and generates the first recording data. The recording data and the extension data for at least two tracks in the digital recording format are continuously recorded with respect to one track formed in a second magnetic tape shape having a tape width wider than that of the magnetic tape.

In this digital signal magnetic recording method, at least two tracks in the digital recording format applied to the first magnetic tape are applied to one track formed in the shape of the second magnetic tape having a wider tape width than the first magnetic tape. Record data and extended data are recorded continuously.

A magnetic signal reproducing apparatus of a digital signal according to the present invention is wider than a predetermined tape width in which recording data corresponding to a digital recording format applied to a first magnetic tape having a predetermined tape width and extended data of the recording data are recorded. Reproducing means for reproducing the record data and the extended data from the wide second magnetic tape, record data processing means for performing data processing of the record data reproduced by the reproducing means, and extended data generated by the reproducing means Extended data processing means for performing data processing, and said reproducing means is configured to continuously reproduce at least two tracks of recorded data in the digital recording format from one track formed on the second magnetic tape. It features.

In this digital signal magnetic reproducing apparatus, at least two tracks in the digital recording format applied to the first magnetic tape with respect to one track formed in the shape of the second magnetic tape having a wider tape width than the first magnetic tape. Recorded data and extended data are reproduced in succession.

A magnetic signal reproducing method according to the present invention is characterized in that the recording data corresponding to the digital recording format applied to the first magnetic tape having a predetermined tape width and the extension data of the recording data are wider than the predetermined tape width on which the recording data is recorded. From one track formed on this wide second magnetic tape, at least two tracks of recorded data and extended data in the digital recording format are continuously reproduced, data processing of the reproduced recorded data is performed, and reproduced extended data. It characterized in that the data processing of.

In the digital signal reproducing method, at least two tracks in the digital recording format applied to the first magnetic tape are applied to one track formed in the shape of the second magnetic tape having a wider tape width than the first magnetic tape. Recorded data and extended data are reproduced in succession.

A tape-shaped recording medium according to the present invention is a tape-shaped recording having a width wider than the predetermined tape width in which recording data and extended data corresponding to a digital recording format applied to a first magnetic tape having a predetermined tape width are recorded. As a medium, at least two tracks in the digital recording format are recorded for one recording track.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the track pattern at the time of recording the DV system digital signal on the magnetic tape of 6.35 mm tape width used by DV system.

2 is an explanatory diagram showing a spectrum of a pilot signal superimposed on data of each track;

Fig. 3 is an explanatory diagram showing a track pattern when a digital signal of a recording method to which the present invention is applied for recording video data, audio data, and the like on a magnetic tape is recorded in a magnetic tape shape having a tape width of 8 mm.

4 is an explanatory diagram for explaining a tape winding angle to a rotating drum in the recording method to which the present invention is applied.

5 is an explanatory diagram for explaining an effective lap angle in one track in the recording method to which the present invention is applied.

Fig. 6 is an explanatory diagram for explaining a tape-shaped track pattern in the recording method to which the present invention is applied.

Fig. 7 is an explanatory diagram for explaining a data pattern of a track in the recording method to which the present invention is applied.

Fig. 8 is an explanatory diagram for explaining a data pattern of a normal area of a track in the recording method to which the present invention is applied.

Fig. 9 is an explanatory diagram for explaining a data pattern of an extended area of a track in the recording method to which the present invention is applied.

10 is a block diagram of a recording and reproducing apparatus according to the embodiment of the present invention;

Fig. 11 is a block diagram of a DV data processing unit of the recording / playback apparatus according to the embodiment of the present invention.

Fig. 12 is a block diagram of the recording / reading unit of the recording / playback apparatus according to the embodiment of the present invention.

Fig. 13 is an explanatory diagram for explaining the procedure of switching the magnetic head and the ATF pilot signal at the time of recording in a DV recording / reproducing apparatus.

Fig. 14 is an explanatory diagram for explaining the procedure of switching the magnetic head and the ATF pilot signal during recording of the recording / playback apparatus according to the embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

1: 8mm tape 10: record and playback device

11: imaging section 12: DV data processing section

13: extended data processor 14: recording / reading unit

(Embodiment of the Invention)

First, as an embodiment of the present invention, a recording method for recording video data, audio data and the like on a magnetic tape which is a tape-shaped data recording medium will be described. The recording method to which the present invention is applied is a method of recording a so-called DV system digital signal on a magnetic tape having a tape width of 8 mm, and here, the digital 8 mm system will be referred to. In the following, the recording method to which the present invention is applied will be described in comparison with the DV method (IEC 61834) and the 8 mm method (IEC 60843), which are conventionally known recording methods.

FIG. 1 shows a track pattern when a DV system digital signal is recorded on a magnetic tape having a tape width of 6.35 mm (hereinafter, referred to as a DV tape) used in the DV system.

In the DV system, as shown in Fig. 1, a video signal and the like are recorded by a rotating drum with respect to a DV tape having a tape width of 6.35 mm (= 1/4 inch). In this rotating drum, for example, two magnetic heads having different azimuth angles are provided at positions facing 180 degrees. Therefore, two magnetic heads are scanned at a predetermined angle with respect to the running direction of the DV tape, and as shown in Fig. 1, a track pattern is formed. In this DV system, the track recorded by one magnetic head is an odd (odd) track (01, 03, O5, O7, O9), and the track recorded by the other magnetic head is an even (Even) track (E2). , E4, E6, E8, and E10, video signals corresponding to the NTSC system are recorded for one frame on all ten tracks of five odd tracks and five even tracks. In the PAL system, a video signal of one frame is recorded on all 12 tracks.

In this DV system, 24/25 conversion is performed on all data recorded on each track. By 24/25 conversion of recorded data, a pilot signal for ATF (Automatic Track Finding) is superimposed on the entire track. The magnetic head can be tracked by detecting this pilot signal during playback. In this 24/25 conversion, by inserting an extra bit (1 bit) for data for every 24 bits (3 bytes), the low-pass pilot component of three frequencies is superimposed on the data string of data to be recorded. Specifically, the run length of the data to be recorded is 9 or less, and pilot signals of frequency f0, frequency f1, and frequency f2 satisfying the spectrum of FIG. 2 are superimposed on each track. In this DV system, for example, the pilot signals of frequency f0 are superimposed on the odd tracks O1, O3, 05, 07 and O9, and the even tracks E2, E4, E6, E8 and E10. The pilot signals of frequency f1 and frequency f2 are alternately superimposed. Therefore, as a whole, pilot signals of respective frequencies that are repeated such as f0, f1, f0, f2, f0, f1, f0, f2 ... are recorded for each track. By recording such a pilot signal, when the magnetic head scans a track on which the frequency f0 is recorded, the pilot components of the frequencies f1 and f2 can be obtained as crosstalk signals from adjacent tracks, and stable tracking during reproduction is achieved. Can be added.

Fig. 3 shows a track pattern when a digital 8 mm digital signal to which the present invention is applied is recorded on a magnetic tape having a tape width of 8 mm (hereinafter, this magnetic tape is called an 8 mm tape).

In the digital 8mm system, a digital video signal or the like is recorded on a 8mm tape having a wider tape width than a DV tape. This 8mm tape is the same as the magnetic tape used in the 8mm system (IEC60843) which records the conventional analog video signal. In the rotating drum for rotating recording, as in the conventional analog 8 mm system, for example, two magnetic heads having different azimuth angles are provided at positions facing 180 degrees with the rotation center. Therefore, two magnetic heads are scanned at a predetermined angle with respect to the running direction of the 8 mm tape, and a track pattern as shown in Fig. 3 is formed.

Here, in the digital 8mm system, data for two tracks in the DV system is continuously recorded with respect to one track of an 8mm tape according to the DV system data pattern. That is, in the digital 8mm system, the odd track data and the even track data in the DV system are set, and the contents of the data are recorded in one track without changing the data.

For example, in the digital 8mm system, the data of the odd track 01 and the even track E2 in the DV system are set as a set and recorded in one track. In the next track, data of the odd track O3 and the even track E4 are recorded as a set. In addition, for each track having a continuous 8 mm tape shape such as an odd track O5 and an even track E6, an odd track O7 and an even track E8, and an odd track O9 and an even track E10, Data of two consecutive tracks in the DV system is recorded as a set.

Therefore, in the digital 8mm system, the video signal corresponding to NTSC is recorded for one frame on five tracks of an 8mm tape. In addition, a video signal corresponding to PAL is recorded for one frame on six tracks of an 8 mm tape.

In this digital 8mm system, extended data is recorded simultaneously with two tracks of data in the DV system for one track of an 8mm tape.

In the digital 8 mm system, the pilot signals of three frequencies f0, f1, and f2 for ATF are superimposed on each track by performing 24/25 conversion. That is, a pilot signal having a different frequency is recorded every two tracks for each track in the digital 8mm system and for each track if the DV system is supported. Specifically, for each track comprising one set of even track data and odd track data in the DV system, f0, f1, f0, f2, f0, f1, f0, f2, ... Record pilot signals of the same repeating frequency. By recording the pilot signal in this manner, when the magnetic head scans the track on which the frequency f0 is recorded, the pilot components of the frequencies f1 and f2 can be obtained as crosstalk signals from adjacent tracks, and stable tracking during reproduction. Can be added. This pilot signal is also recorded in the extended data. The pilot signal recorded in the extended data is set to the same frequency as the data for two tracks in the DV system recorded in the track.

4, the figure for demonstrating the winding angle of a tape with a rotating drum in the digital 8 mm system is shown.

As shown in FIG. 4, in the digital 8 mm system, an 8 mm tape is wound by a rotating drum in the range of 206 degrees. The signal recorded when one magnetic head moves in the range of the winding angle of 206 degrees constitutes one track in the shape of an 8 mm tape. Moreover, the winding angle of this 8 mm tape may be 211 degrees like the conventional analog 8 mm system, and you may make it record a signal in the range of 206 degrees among them.

Fig. 5 shows a diagram for explaining the effective lap angle in one track in the digital 8mm system. 6, the figure for demonstrating the tape-shaped track pattern in the digital 8mm system is shown.

In the digital 8mm system, the effective lap angle is 177 ° as shown in FIGS. 5 and 6. In this effective lap angle, two sub-tracks SubTr # 0 and SubTr # 1 are provided. Each sub track has a winding angle in the range of 87 °, and data for one track in the DV system is recorded as it is in the DV system data format. In other words, within this effective lap angle, the above-described odd track and even track data are continuously recorded one track by one track. In the effective lap, a gap of 3 DEG (ITG: Inter Track Gap) is set between two sub tracks SubTr # 0 and SubTr # 1.

In addition, in the digital 8 mm system, an extended area is set at the front end of the effective lap angle, that is, at the head inlet side of the track. The winding angle of this extension area | region is 26 degrees. Therefore, the winding angle of one track is a total of 206 ° in combination with the reduction angle of 26 ° of the extended area and 177 ° of the effective lap angle.

Moreover, in this digital 8mm system, the two magnetic heads provided in the rotating drum are switched by the switching pulse SWP generated in synchronization with the rotating phase of the rotating drum. When the recording of data in the effective lap angle by one magnetic head (for example, Ach) is finished, the switching pulse SWP is changed, and the data in the effective lap angle of the other magnetic head (for example, Bch) is changed. The recording starts. This switching pulse SWP changes every time the rotating drum rotates 180 degrees. Therefore, a margin of 1.5 degrees occurs at the front and rear ends of the effective lap angle.

In addition, the data of the extended area portion is synchronized with, for example, the extended track sync information Ex-ITI or the track sync information ITI of the previous track, before the switching pulse SWP is changed. Recording starts from.

In the digital 8mm system, the track angle of the track formed in the 8mm tape shape, that is, the angle formed by the head travel direction and the tape travel direction is 4.8999 °. In addition, the width from one end of the 8 mm tape in the longitudinal direction of the head inlet to the recording start position of the extended area is 1.013 mm. The width from one end of the head inlet side in the longitudinal direction of the 8 mm tape to the recording start position of the effective lap angle is 1.786 mm. The width from one end of the head inlet side to the recording end position of the effective lap angle in the longitudinal direction of the 8 mm tape is 7.047 mm. The width from the recording start position of the effective lap angle to the recording end position of the effective lap angle is 5.261 mm. The width from one end of the 8 mm tape on the head inlet side in the longitudinal direction to the center position of the effective lap angle, that is, the recording start position of the sub track SubTr # 1, is 4.461 mm. Moreover, each width | variety in the 8 mm tape shape shown above has shown the distance with respect to the direction orthogonal to a tape running direction.

Hereinafter, an example of the specification of the recording method for the magnetic tape to which the present invention is applied will be specifically shown in the table in correspondence with NTSC and PAL. In addition, some of the specifications of the conventional analog 8mm system are also presented for comparison.

As described above, in the recording method for the magnetic tape to which the present invention is applied, since two pieces of data of the DV method are continuously recorded in a data pattern as it is on a 8mm tape, the tape area can be effectively used. It is possible to record for a longer time. In other words, if recording for the same time is performed, the required tape length can be shortened and the tape consumption can be improved as compared with the case of recording one track pattern of DV on an 8 mm tape.

Of course, this recording method is an example, and it is possible to record three tracks or four tracks of the DV method and more than one track in succession. This makes it possible to record longer periods of time, and conversely, if the same length of time is recorded, it becomes possible to shorten the length of the tape required.

In addition, using this recording method, the recording / playback apparatus can use the mega deck portion of a conventional analog 8mm video tape recorder as it is by changing the rotational speed of the drum from 1800rpm to 4500rpm. It is possible to form a track pattern.

In addition, the capstan's speed (that is, the tape feed speed) only determines the track pitch, and the required track pitch is an item that is determined depending on the characteristics of the tape, the head, or whether or not compatibility is necessary.

Next, the data format of the data recorded in the effective lap angle and the data format of the data recorded in the extended area will be described in more detail. In addition, the area | region within an effective lap angle is called a normal area | region with respect to an extended area | region.

In the digital 8mm system, as shown in FIG. 7, a guard area Guard is set between an extended area and a normal area. This guard area | region has a winding angle of 1.95 degrees.

As shown in Fig. 8, the normal area includes a first sub track (SubTr # 0), a gap (ITG), and one track of the DV system in which data for one track of the DV system is recorded as it is in the DV data pattern. It consists of the 2nd sub track SubTr # 1 in which minute data is recorded. In this normal area, 274624 bits for NTSC and 274350 bits for PAL are recorded.

In the case of NTSC, the first sub track SubTr # 0 has a preamble (1400 bits), track synchronization information (ITI: 1920 bits), a postamble (280 bits), a gap (625 bits), and the like from the head inlet side. Preamble (500bit), Audio Data (10500bit), Postamble (550bit), Gap (700bit), Preamble (500bit), Video Data (111750bit), Postamble (975bit), Gap (1550bit), Runup (1200bit), Sub A code 1200 bit and a guard area 1200 bit are recorded in this order. In the case of PAL, the last guard region is 1335 bits. The data recorded in the first sub track SubTr # 0 is the same as the data recorded in one track in the DV system.

The same data as the first sub track is also recorded in the second sub track SubTr # 0.

In the gap ITG, an erase margin of 1250 bits and a gap of 2150 bits (2155 bits in the PAL) are set.

In the extended area, as shown in FIG. 9, in the case of NTSC, the preamble (1400 bits), the extended track sync information (Ex-ITI: 1920 bits), the postamble (280 bits), and the gap (2325 bits) from the head inlet side , Preamble (500bit), first extension data (Ex-DATA: 10500bit), postamble (550bit), gap (2325bit), preamble (500bit), second extension data (Ex-DTA: 10500bit), postamble (550 bit), gap (2325 bit), run up (1200 bit), extension sub code (Ex-SubCode: 1200 bit), guard area (1200 bit), and gap (3065 bit) are recorded in this order. In the case of PAL, the last guard region is 1335 bits.

The extension track synchronization information of the extension area is used as a reference for the time axis and tracking servo, similar to the track synchronization information of the DV system. The extension subcode of the extension area is also used as additional information such as video data and audio data, similarly to the subcode of the DV system.

In the areas of the first and second expansion data, audio data having the same configuration as that of the audio data area of the normal area can be recorded. Therefore, audio data can be recorded in the extended area independently of the normal area, and after recording can be facilitated. In addition, when audio data is recorded in the extended area, for example, as an extended sub code, the time code of the recorded audio data and switching information with the audio data in the normal area may be recorded.

It is also possible to record a telop image, a still image, or other digital information in the area of the expansion data.

By providing such an extended area, in the digital 8mm system, after-recording of audio data and image data can be performed without overwriting (overlapping) the data recorded in the normal area. In particular, having sufficient gap and track synchronization information for data in this extended area enables reliable after-recording. In the DV system, since the sub code is behind the track, it is difficult to rewrite the sub code alone due to the linearity. However, since the sub code in the extended area is near the expansion ITI, only the sub code can be easily rewritten. It becomes possible.

Next, a recording / reproducing apparatus for recording video data and audio data using the digital 8 mm method described above will be described.

10 shows a schematic configuration of a recording / playback apparatus according to the embodiment of the present invention.

The recording and reproducing apparatus 10 according to the embodiment of the present invention is a so-called camera-integrated video tape recorder, which records video data and the like constructed in the digital 8mm system on an 8mm tape 1, and furthermore, the 8mm tape 1 Is a device for reproducing this video data and the like.

In the recording and reproducing apparatus 10 according to the embodiment of the present invention, an image capturing unit 11 for imaging an object and outputting an analog video signal, and converts the analog video signal generated by the image capturing unit 11 into DV data, The DV data processing unit 12 converts the DV data read from the 8 mm tape 1 into an analog video signal, and the extended data recorded in the extended area of the 8 mm tape 1 and generates an 8 mm tape 1. An extended data processor 13 for performing data processing of the extended data read from the extended area of < RTI ID = 0.0 >), a recording / reading part 14 for writing and reading data to / from the 8 mm tape 1, and controlling the respective parts. The main controller 15 is provided. The recording / reproducing apparatus 10 further includes a video output terminal 16 for outputting an analog video signal, an audio input / output terminal 17 for inputting / outputting an audio signal, and an audio signal input from the audio input / output terminal 17 for DV. The audio signal outputted from either the data processor 12 or the extended data processor 13 is replaced, and the audio signal outputted from either the DV data processor 12 or the extended data processor 13 is replaced and outputted from the audio input / output terminal. The switch 18 is provided.

The imaging unit 11 is composed of, for example, an optical system such as a lens, a CCD, and an electric system such as a signal processing circuit. The imaging unit 11 generates analog video signals (luminance signal, red difference signal, blue difference signal) and sends the analog video signal to the DV data processing unit 12.

At the time of recording, the DV data processing unit 12 has an analog video signal transferred from the imaging unit 11, an analog audio signal supplied from the outside through the audio input / output terminal 17, and an addition transferred from the main controller. Information is entered. At the time of recording, the DV data processing unit 12 converts these signals and information into a data format corresponding to the DV system as shown in FIG. 8, so that one track of data in the DV system (that is, The data is sent to the recording / reading unit 14 for each sub track (data recorded in SubTr # 0 or # 1). The DV data processing unit 12 transfers the DV data read from the normal area (that is, within the effective lap angle) of the 8 mm tape 1 at the time of reproduction from the recording / reading unit 14. The DV data processing unit 12 divides the video data, the audio data, and the additional information from the DV data at the time of reproduction. The DV data processing unit 12 converts the divided video data into an analog video signal, and outputs the analog video signal to the outside via the video output terminal 16. In addition, the DV data processing unit 12 converts the divided audio data into an analog audio signal, and outputs the analog audio signal through the audio input / output terminal 17. In addition, the DV data processing unit 12 sends the divided additional information to the main controller 15.

In the extended data processing unit 13, an audio signal supplied from the outside through the audio input / output terminal 17 and additional information transferred from the main controller are input at the time of recording or after recording of audio. The extended data processing unit 13 converts these signals and information into a data format for recording in the extended area as shown in Fig. 9, and records / reads 14 as extended data for recording in this extended area. Send to In the extended data processing unit 13, the extended data read out from the extended area of the 8 mm tape 1 is transferred from the recording / reading unit 14 at the time of reproduction. The extended data processing unit 13 divides the audio data and the additional information from this extended data. The extended data processor 13 changes the divided audio data into an analog audio signal, and outputs the analog audio signal through the audio input / output terminal 17. The extended data processing unit 13 also sends the divided additional information to the main controller 15.

The extended data processor 13 performs 24/25 conversion on the recorded extended data and records the pilot signal. This pilot signal has the same frequency as the pilot signal recorded in the DV data recorded in the track.

The switch 18 switches the terminal to the DV data processing unit 12 to supply the audio signal to the DV data processing unit 12 when recording the audio signal in the audio area within the normal area at the time of recording. In the case of recording audio data in the extended data area in the extended area at the time of recording or after-recording, the switch 18 switches the terminal to the extended data processing unit 13 side to transfer the audio signal to the extended data processing unit 13. Supply. In addition, when outputting audio data in a normal area at the time of reproduction, the switch 18 switches the terminal to the DV data processing unit 12 and sends the audio signal output from the DV data processing unit 12 from the audio input / output terminal. . In addition, when outputting audio data in the extended area at the time of reproduction, the switch 18 switches the terminal to the extended data processing unit 13 and sends the audio signal output from the extended data processing unit 13 from the audio input / output terminal. do.

The recording / reading unit 14 performs switching control of the magnetic head, rotation control of the rotating drum, control of the traveling speed of the 8 mm tape 1, and the like, and records the DV data and the expansion data into the normal area and the extended area. And read.

The main controller 15 supplies the control of the DV data processing unit 12, the control of the extended data processing unit 13, the control of the recording / reading unit 14, the DV data processing unit 12 and the extended data processing unit 13. Generation of additional information, processing of additional information read from the 8mm tape 1, and the like. In addition, the main controller 15 also performs switching control of the switch 18.

Next, the configuration and processing details of the DV data processing unit 12 will be described in more detail.

11 is a block diagram of the DV data processing unit 12.

The DV data processing unit 12 includes an A / D converter 21, a D / A converter 22, a blocking / shuffling unit 23, a memory 24, a discrete cosine transform / inverse discrete cosine transform ( DCT / IDCT) section 25, quantization / dequantization section 26, fixed-length section 27, shuffle / deshuffle section 28, memory 29, AD / DA converter 31 ), An audio data processing unit 32, a multiplex / demultiplex unit 33, an ECC unit 34, a 24/25 converter 35, and a modulation / demodulation unit 36. have.

First, the processing contents of the DV data processing unit 12 at the time of recording will be described.

The analog video signals (luminance signal, red difference signal, blue difference signal) supplied from the imaging unit 11 are converted into digital data by the A / D converter 21. The video data digitized by the A / D converter 21 is transferred to the blocking / shuffling section 23.

The blocking / shuffling unit 23 performs block processing and shuffling processing on the video data. The block processing divides the video data (luminance data Y, red difference data C _R , blue difference data C _B ) into 8 × 8 pixel blocks, which are the basic units of DCT (discrete cosine transform). Treatment. Further, a total of six blocks composed of four blocks of luminance data Y and one block of color difference data C _R and C _B are treated as one processing unit. This processing unit is called a micro block. The shuffling process is a process of replacing data in units of 5 micro blocks so that the amount of data after being compressed is averaged in the screen. Block processing and shuffling processing are performed on the memory 24. Video data subjected to block processing and shuffling processing is transferred to the DCT / IDCT unit 25.

The DCT / IDCT unit 25 performs DCT on the input video data, orthogonally transforms the video data, and sends the video data to the quantization / dequantization unit 26.

The quantization / dequantization unit 26 divides the DCT coefficients into integer values called quantization steps to perform quantization. Specifically, quantization is performed by selecting a quantization step that becomes the maximum number of bits within a range in which the number of bits after quantization does not exceed the target number of bits. The quantization / dequantization unit 26 performs variable length coding by zigzag-scanning DCT coefficients quantized for each block from DC component data. The video data subjected to quantization and variable length coding is transferred to the fixed lengthizer 27.

The fixed lengthizer 27 packs the input video data every five sync blocks. A sync block represents the small area | region which divided the track of the magnetic tape (8mm tape 1 and DV tape). That is, the recording area of the magnetic tape-shaped track is divided into small areas called sync blocks, and the video data is packed in this unit. In the DV system, the number of sync blocks included in one track is 135. In the digital 8mm system of the embodiment to which the present invention is applied, since two tracks of data in the DV system are recorded in one track, the number of sync blocks included in one track is 270, which is double that. The video data packed for every five sync blocks is transferred to the shuffle / deshuffle unit 28.

The shuffle / deshuffle unit 28 replaces the data on the memory 29 so that the video data packed every five sync blocks can be reproduced in the same flow as possible with the temporal flow of the original image. The replaced video data is transferred to the multiplex / demultiplex unit 33.

The analog audio signal supplied from an external microphone or audio input terminal is converted into digital data by the AD / DA converter 31. The audio data digitized by the AD / DA converter 31 is transferred to the audio data processing unit 32.

The audio data processing unit 32 sends the input audio data to the data format and multiplex / demultiplex unit 33 according to the DV system such as packing for each sync block.

In addition, the main controller 15 sends additional information for recording the sub code, ITI, video AUX, audio AUX, etc. to the multiplex / demultiplex unit 33, for example, information about a track and a video. The title of the data, the title of the audio data, and the like are sent to the multiplex / demultiplex unit 33.

The multiplex / demultiplex unit 33 multiplexes the supplied video data, audio data, and additional information so as to form one track of data in the DV system. The multiplexed data is then sent to the ECC unit 34 for each track of data in the DV system.

The ECC unit 34 adds an error correction code unit to the data supplied for each track in the DV system. The ECC unit 34 adds inner parity and outer parity independently of the video data, the video data, and the additional information. The data to which the error correction code is added is transferred to the 24/25 converter 35.

The 24/25 converter 35 converts the supplied data 24/25, and superimposes the pilot signals of the three frequencies f0, f1, and f2 for the ATF on the data. Here, the 24/25 converter 35 records pilot signals having different frequencies for each track in the digital 8 mm system. Specifically, the same pilot signal is added for every two tracks of data in the DV system. The 24/25 converted data is transferred to the modulator / demodulator 36.

The modulator / demodulator 36 performs channel coding on the data to be recorded, and converts the data string so as to be suitable for the digital recording / reproducing system.

In recording, the DV data processing unit 12 outputs the data processed as described above as DV data.

Subsequently, the processing contents of the DV data processing unit 12 during reproduction will be described.

At the time of reproduction, the DV data read from the 8 mm tape 1 by the recording / reading unit 14 is supplied to this DV data processing unit 12.

The modulator / demodulator 36 demodulates the channel coded data and sends it to the 24/25 converter 35. The 24/25 conversion unit 35 removes the extra bit, in which one bit is added to the 24-bit data of the demodulated data, and converts the data into the data before 24/25 conversion. The 24/25 converter 35 sends the data from which the extra bits have been removed to the ECC unit 34. The ECC unit 35 performs an error correction process based on the error correction code added to the video data, the audio data, and the additional information, respectively. The data subjected to the error correction processing is transferred to the multiplex / demultiplex unit 33.

The multiplex / demultiplex unit 33 separates video data, audio data, and additional information multiplexed for each track in the DV system. The separated additional information is transferred to the main controller 15. The separated audio data is subjected to data processing by the audio data processing unit 32, and then converted into an analog signal by the AD / DA converter 31 and output to the outside. In addition, the separated video data is transferred to the shuffle / deshuffle unit 28.

This video data is deshuffled by the shuffle / deshuffle section 28, debugged by the fixed-lengthizer 27, and dequantized by the quantization / dequantizer 26, and DCT / It is transferred to IDCT unit 25. The DCT / IDCT unit 25 performs IDCT on the input video data and sends it to the blocking / shuffling unit 23. The blocking / shuffling section 23 performs deshuffle processing and block decomposition processing on the input video data, and sends it to the D / A converter 22.

The D / A converter 22 converts digital video data into an analog video signal and outputs it to an external device.

In reproduction, the DV data processing unit 12 reads DV data from the 8 mm tape 1 and outputs an analog video signal and an audio signal to the analog.

Next, the configuration and processing details of the recording / reading section 14 will be described in more detail.

12 is a block configuration diagram of the recording / reading unit 14.

The recording / reading unit 14 drives the rotating drum 40, the first magnetic head 41 and the second magnetic head 42 provided on the rotating drum 40, and the first magnetic head 41. A first amplifier 43, a second amplifier 44 driving the second magnetic head 42, a data synthesizing / separating unit 45 for synthesizing and separating the DV data and the extended data to be recorded, and 8 mm The tape traveling system 46 which drives the tape 1, the drum drive system 47 which drives the rotating drum 40, and the control part 48 are provided.

The 8 mm tape 1 is wound around the rotating drum 40. Moreover, the 1st magnetic head 41 and the 2nd magnetic head 42 are provided in this rotating drum 40 in the position which opposes 180 degree with the rotation center.

The first magnetic head 41 and the second magnetic head 42 rotate on the 8 mm tape 1 at an angle of 4.8999 ° with respect to the longitudinal direction by rotating the rotary drum 40 to record signals. And playback. The first magnetic head 41 and the second magnetic head 42 are changed in accordance with the rotational position of the rotary drum 40, and signal recording or reproduction is performed. This switching is performed in synchronization with the switching pulse SWP generated by the control unit 48. The control part 48 generates the switching pulse SWP which changes high / low whenever the rotating drum 40 rotates 180 degrees based on the PG signal which shows the rotational phase of the rotating drum 40. FIG. For example, the period in which the switching pulse SWP is high is changed to the first magnetic head 41 so that recording or reproducing of the signal is performed, and the period in which the switching pulse SWP is low is the second magnetic head 42. The signal is changed to and the signal is recorded or reproduced.

The tape run meter 41 drives the 8 mm tape 1 at a constant speed during normal recording and playback.

The drum drive system 47 drives the rotary drum 40 at a constant rotational speed (4500 rpm) during normal recording and playback.

The control unit 48 controls the rotational phase of the rotary drum 40 at the time of reproduction, and performs tracking control of the first magnetic head 41 and the second magnetic head 42. Control of the rotational phase of the rotary drum 40 is performed in accordance with the ATF pilot signal detected by the data synthesizing / separating unit 45. That is, the ATF pilot signal is superimposed on the data recorded in each track. The control unit 48 crosses the pilot components f1 and f2 from adjacent tracks when the first magnetic head 41 (or one of the second magnetic heads 42) scans a track in which the frequency f0 is recorded. Detected as a torque signal, tracking is applied so that pilot signals from adjacent tracks are equal.

The control unit 48 also detects ITI or EX-ITI at the time of reproduction or overwrite recording, and controls the recording position or reproduction position of the magnetic head in the track. For example, only audio data is rewritten, only video data is rewritten, only sub codes are rewritten, or in case of rewriting only extended data, the data is obtained when the magnetic head is made to a predetermined position in one track. Overwrite is started, and control is performed so that new data is not recorded on the data of the other parts. Specifically, when rewriting audio data of the normal area or video data of the normal area, the control unit 48 detects an ITI recorded at the head of the track of the normal area, generates a clock, and generates a clock. 40, recording control of the first magnetic head 41 and the second magnetic head 42 is performed. In the case of rewriting the extended data of the extended area or the sub code of the extended area, the clock is generated by detecting the EX-ITI recorded at the head of the extended area, and the rotary drum 40 and the first magnetic head are detected. (41) The recording control of the second magnetic head 42 is performed.

When all data of the extended area is recorded while only the data of the normal area is recorded and no data of the extended area is recorded at all, for example, a clock is generated using the ITI of the normal area of the previous track. You may also In this case, since the distance from the detection of the ITI to the extended area is long, there is a possibility that an error may occur. However, since a sufficient gap or guard is set in the extended area, there is no problem.

At the time of recording, DV data is supplied from the DV data processing unit 12 to the data synthesizing / separating unit 45, and extended data is supplied from the extended data processing unit 13. The data synthesizing / separating unit 45 separates the DV data by two tracks in the DV system at the time of recording, and simultaneously combines the separated DV data with data for one track of the extended data. Then, one track of data in this digital 8mm system is formed. The data synthesizing / separating unit 45 changes the magnetic head to be recorded in accordance with the switching pulse SWP, and supplies one track of data to the changed magnetic head.

In addition, the data synthesizing / separating unit 45 is supplied with data read from the 8 mm tape 1 from the first magnetic head 41 and the second magnetic head 42 at the time of reproduction. The data synthesizing / separating section 45 reads one track of data supplied from each of the magnetic heads 41 and 42 from two tracks of DV data in the DV system, which is read from a normal area, and an extended area. Separate from one extended data. The data synthesizing / separating unit 45 supplies the separated DV data to the DV data processing unit 12 while changing the magnetic head to be read in accordance with the switching pulse SWP, and expands the separated extended data. It supplies to the process part 13.

Here, the switching timing of the magnetic heads 41 and 42 at the time of recording of the recording / playback apparatus 10 according to the embodiment of the present invention is switched to the magnetic head at the time of recording of the conventional DV recording / reproducing apparatus. It demonstrates, comparing with timing.

FIG. 13 shows the switching timing of the magnetic head and the sequence of the ATF pilot signal at the time of recording of the conventional DV recording / reproducing apparatus, and FIG. 14 shows the recording / reproducing apparatus 10 of the embodiment of the present invention. The switching timing of the magnetic heads 41 and 42 and the order of the ATF pilot signals at the time of recording are shown. In the conventional DV recording / reproducing apparatus, the diameter of the rotating drum is 21.7 mm, and the drum rotation speed is 9000 rpm. In the case of the recording / reproducing apparatus 10 of the embodiment of the present invention, The diameter is 40 mm, and the drum rotation speed is 4500 rpm.

First, in the conventional DV recording / reproducing apparatus shown in Fig. 13, the RF signal has a clock frequency (recording rate / 1 head) of 41.85 Mbps, and this RF signal is used for the odd track data (0ch) and the even track. It is arranged alternately with data Ech. The RF signals of the odd track Ech and the even track 0ch each have a length corresponding to 174 degrees of the drum rotation angle, and the drum rotation between the odd track Och and the even track Ech. It is formed with a period corresponding to every three degrees of an angle.

As shown in Fig. 13, the two heads disposed on the rotary drum operate as the heads for the even track Ech and the heads for the odd track Och. Each time it rotates 180 degrees, it changes by the switching pulse SWP for head switching alternately.

Thus, the RF signals of the odd track Och and the even track Ech are recorded on one track every 174 degrees of the drum rotation angle.

In addition, the ATF pilot signal in the conventional DV recording / reproducing apparatus is used for each track alternately arranged as an odd track Och and an even track Ech. F0, f1, f0, f2, The repetition is repeated as f0, f1, ...

On the other hand, in the recording / reproducing apparatus 10 of the embodiment of the present invention, the clock frequency (recording rate / 1 head) of the RF signal is 41.85 Mbps, which is not different from the conventional DV recording / reproducing apparatus. On the first sub track SubTr # 0, the data of the odd track Och of the conventional DV recording / reproducing apparatus is recorded, and on the second sub track SubTr # 1, the conventional DV recording / reproducing apparatus The data of the even track Ech is recorded. A period corresponding to every three degrees of the winding angle is formed between the first sub track SubTr # 0 and the second sub track SubTr # 1, and the start of data of the first sub track SubTr # 0 is started. The rotation angle from the position to the start position of data of the next first sub track SubTr # 0 is 180 °. As shown in FIG. 14, the two magnetic heads 41 and 42 disposed on the rotating drum 40 are one set of RF signals of the sub track SubTr # 0 and the sub track SubTr # 1. For each channel consisting of, the switching pulses SWP are alternately changed.

That is, as the recording / playback apparatus 10 according to the embodiment of the present invention, one set of RF signals of the odd track Och and even track Ech in the DV system is treated as one channel. One channel consisting of one set of these RF signals is recorded as one track each time the drum rotates 180 degrees.

Further, the ATF pilot signal in the recording / playback apparatus 10 according to the embodiment of the present invention is used for each track in which one channel consisting of one set of these RF signals is alternately arranged. The repetition is repeated such as f0, f2, f0, f1, ... The above-mentioned head switching and set switching of the ATF pilot signal are performed to form a track pattern.

As described above, in the recording / playback apparatus 10 according to the embodiment of the present invention, the DV system data can be recorded on the magnetic tape having a wider tape width than the magnetic tape used in the DV system such as an 8 mm video tape. have. At the same time, by recording two tracks of data in the DV system continuously on one track without changing the data format, the tape area can be effectively used, and the recording for longer periods is possible. do. On the contrary, when recording for the same time, the required tape length can be shortened and the tape consumption can be improved as compared with the case where the DV track pattern is recorded one by one on a wide tape.

In the recording / reproducing apparatus 10 according to the embodiment of the present invention, for example, a simple change only by changing the drum rotation speed with respect to the mega deck of the existing 8 mm tape recorder, the switching pulse of the DV signal system, and the ATF pilot signal With only a small change in the set switching, the DV format signal can be recorded on an 8mm video tape, so that resources such as production equipment and components of a conventional video tape can be effectively used.

In the recording / reproducing apparatus 10 of the embodiment of the present invention, since the extended area is provided, after-recording of audio data and image data can be performed without overwriting the data recorded in the normal area. In particular, having sufficient gap and track synchronization information for data in this extended area enables reliable after-recording. In addition, in the recording / reproducing apparatus 10, since the sub code is behind the track, it is difficult to rewrite the sub code alone under the influence of linearity, but since the sub code in the extended area is near the expansion ITI, only the sub code is used. Can be easily rewritten.

According to the present invention, at least two tracks of recording data and extended data in a digital recording format applied to a first magnetic tape for one track formed in a second magnetic tape shape having a wider tape width than the first magnetic tape. Record or play back continuously. According to the present invention, it is possible to record data for a long time with high quality with respect to the second magnetic tape, and at the same time, it is possible to effectively utilize resources such as conventional production equipment and components. In addition, in the present invention, since an audio signal, an image signal, and the like can be recorded as extended data, additional recording, editing, etc. of these data can be facilitated.

Claims (15)

Recording data generating means for generating recording data corresponding to the digital recording format applied to the first magnetic tape having a predetermined tape width; Extended data generating means for generating extended data of the record data; Recording means for recording the record data generated by the record data generating means and the extended data generated by the extended data generating means on a second magnetic tape having a tape width wider than that of the first magnetic tape, The recording means includes at least two tracks of the recording data in the digital recording format generated by the recording data generating means and an extension generated by the expansion data generating means, for one track formed in the shape of the second magnetic tape. A magnetic signal recording device for digital signals, characterized in that data is continuously recorded. The recording data generating means according to claim 1, wherein the recording data generating means includes at least two tracks of recording data and the expansion data generating means in the digital recording format for continuously recording one track of a second magnetic tape. A magnetic recording apparatus for digital signals, wherein the same tracking pilot signal is added to the data. A recording apparatus according to claim 1, wherein said recording data generating means generates recording data corresponding to a DV format, The recording means includes at least two tracks of recording data and the extended data generating means in the DV format generated by the recording data generating means for one track formed in a second magnetic tape shape having a tape width of 8 mm. A magnetic signal recording device for digital signals, characterized by continuously recording the generated extended data. Generate recording data corresponding to a digital recording format applied to the first magnetic tape having a predetermined tape width, Generating extended data of the recording data, At least two tracks of recording data and extended data in the digital recording format are continuously recorded with respect to one track formed in a second magnetic tape shape having a wider tape width than the first magnetic tape. Magnetic recording method of digital signal. 5. The same tracking pilot signal as claimed in claim 4, wherein the same tracking pilot signal is added to at least two tracks of recorded data and extended data in the digital recording format for continuously recording one track of a second magnetic tape. Magnetic recording method of digital signal. The method according to claim 4, wherein recording data corresponding to the DV format is generated, A magnetic signal recording method of a digital signal, characterized in that for each track of a second magnetic tape having a tape width of 8 mm, at least two tracks of recording data and the extension data in the DV format are continuously recorded. The recording data and the extension from the recording data corresponding to the digital recording format applied to the first magnetic tape of the predetermined tape width and the second magnetic tape having a width wider than the predetermined tape width on which the recording data is recorded. Reproducing means for reproducing data; Recording data processing means for performing data processing of the recording data reproduced by said reproducing means; Extended data processing means for processing data of the extended data generated by said reproducing means, And the reproducing means continuously reproduces at least two tracks of recorded data in the digital recording format from one track formed on the second magnetic tape. 8. The tracking device according to claim 7, wherein said reproducing means detects a tracking pilot signal from at least two tracks of recorded data and extended data in said digital recording format recorded continuously for one track of a second magnetic tape. And a tracking control of each track. 8. A recording apparatus according to claim 7, wherein said reproducing means continuously reproduces at least two tracks of recorded data in the DV format from one track formed in a second magnetic tape shape having a tape width of 8 mm, And the recording data processing means performs data processing of the recording data corresponding to the DV format reproduced by the reproduction means. From the recording data corresponding to the digital recording format applied to the first magnetic tape having a predetermined tape width and one track formed on the second magnetic tape having a width wider than the predetermined tape width on which the extended data of the recording data is recorded, Continuously reproduces at least two tracks of recorded data and extended data in the digital recording format, Perform data processing on the recorded data A data reproducing method of a digital signal, characterized by performing data processing of reproduced extended data. 12. The tracking pilot signal according to claim 10, wherein the tracking pilot signal is detected from at least two tracks of recorded data and extended data in the digital recording format continuously recorded for one track of the second magnetic tape. A magnetic recording method of a digital signal, characterized by performing control. The recording data of at least two tracks in the DV format is continuously reproduced from one track formed in a second magnetic tape shape having a tape width of 8 mm, And a data processing of the recording data corresponding to the DV format. A tape-shaped recording medium having a width wider than the predetermined tape width in which recording data and extended data corresponding to a digital recording format applied to a first magnetic tape having a predetermined tape width are recorded. A tape-shaped recording medium, characterized in that at least two tracks in the digital recording format are recorded for one recording track. The same tracking pilot signal is extended to at least two tracks of recorded data and extended data in the digital recording format continuously recorded for one track of the second magnetic tape. Tape-shaped recording medium characterized in that. 14. The tape-shaped recording medium as claimed in claim 13, wherein the tape width is 8 mm and at least two tracks of recording data in the DV format are continuously recorded for one recording track.